Pitman.



' PITMAN.

APPLICATION FILED APR. H, 1914 Pa tented 32m. 4, 1918.

vanar J HN P. GARDNER, OF SAN FRANCISCO, CALIFORNIA.

PITMAN.

Specification ofLetters Patent.

Patented Jan. a, rate.

Application filed April 11, 1914. Serial No. 831,347.

and pitma'n rod connection for mowing ma-- chines, harvesters and the like, and-an" object of the invention is to provide a pitinan rod connection of this nature, which will automatically yield in case the cutting knife becomes obstructed in any manner whatsoever, and permit the rotating or revolving means to rotate or operate unobstructedly. In practical fields the details of construction may necessitate alterations, falling within the scope of what is claimed.

The invention comprises further features and combination of parts, as hereinafter set forth, shown in the drawings and claimed.

In the drawingszFigure l is a view in side elevation, showing the improved yielding connections between the reciprocating cutting member and the roller bearing con: nection on the revolving pitman wheel. 'Fig.

2 is a plan view partly in section of the pitman wheel and theroller bearing connection and the yielding connection.

Referring more particularly tothe draw-. as gings, 1 designates a reciprocating member or cutting bar having an ear 2, formed with an integral ball 3. A rod 4 provided with threads 5 at one end is provided' The other end, portion of the rod 4 is cut away as shown at G to form a reduced part 7, which terminates in a semi-spherical socket 8, which fits one side of the ball 3. A plate 9,conforming to the contour of the rod 41 is provided, and is bolted at 10 .in the cutaway portion 6 of the rod. One end of this plate 9terminates in a semi-spherical socket ,11, which fits the other side of the ball 3, and cooperates with the socket 8, thereby providing a substantially *ball and socket 5G [pivotal joint with the rod 4. A tubular casing 12 is provided, which is threaded at 13 at both ends. A cap 14 engages the threads 13 of one end of the tubular casing, and into thecap lathe threaded end of the rod 4 is as threaded. A cap 15 having a central opening 16 is threaded to the threads 13 at the v of the piston.

other end of the tubular casing. Extending through the cap 15 a piston rod 17, on the end 18 of which a piston 19 is secured by the nut 20. The piston'lt is provided with a suitable packing 21, and is mounted to reciprocate in said tubular casing. Arranged in the tubular casing 12, and surrounding the piston rod and interposed between the piston 19 and the cap 15 is a coil spring 2a,

acting to hold the piston 19 yieldably spaced apart from the cap 15. One end of the cap 15 has a pocket, 25. A revolving or rotating member or wheel 26 of any suitable mowing machine or harvesting machine or the like (not shown) is provided, and is provided with a wrist pin 27 having an integral 001-" lar 28, and beyond the collar the wristpin 27 1s engaged by the roller bearings 29,

which are arranged in the central opening of the disk head 31.

ring 32 is secured to the disk head 31 by the A disk washer or screws 32, so that the opening 3450f the washer 32 receives a part of the integral collar 28. It is to be noted that the integral collar 28 has a shoulder 35, which is contacted with by one face of the washer 32,

thereby preventing the head 31' from moving toward the wheel 26. The washer 32 or ring assists in retaining the roller bearings in place. A disk washer 36 is secured by the screws 37 to the outer end of the wrist pin, thereby preventing displacement of the disk head 31. The disk head 31 is carried by the piston rod 17, as shown at 38 in any suitable manner, and where the piston rod connects to the head, the head is provided with a pocket 39. Surrounding the piston rod 17 and engaging the pockets 25 and 39 is a coil spring 10, which counteracts against the coil spring 24, thereby holding the piston 19 substantially at the junction indicated in Fig. 2, that is, under normal conditions, for instance, when the reciprocating or cutting member or cycle bar is operating properlv and not being obstructed. However, it is to be noted that just as soon as the reciprocating member or cycle bar becomes obstructed, the rotating or. revoluble member or wheel'26 will continue to rotate or revolve, the springs 24 and 40 counteracting one another and yielding, incident to the reciprocating movement The invention having been set forth, What is claimed as new and useful is In combination, a reciprocating member,

the contour of the pocket, a piston rod-extending through the central opening and provided with a piston reciprocating in the casing, a coil spring interposed between the cap and the piston, a revoluble member having a Wrist pin, said piston rod having a disk head at one end, said disk head having a central opening, and an enlargement pro-' vided with a pocket, a coil spring on the piston rod interposed between the pocket of the cap and the pocket of the enlargement, roller bearings in the central opening of the disk head and engaging anti-frictionally with the wrist pin, and means upon each face of the disk head to prevent displace ment ofthe disk head and the roller bear ing, the means upon theouter face of the disk head being secured to the Wrist pin.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN P. GARDNER. Witnesses:

'l VILLIAM A. PEAKE,

J. H. Kznonsn. 

